Column structure and base member

Abstract

In a column structure, a steel column having flanges integrally provided at both width direction ends of a web is welded to a base plate. The base plate is also fixed to first anchor bolts and to second anchor bolts, with the first anchor bolts and the second anchor bolts disposed at the opposite side of the flanges to the web. The second anchor bolts are also disposed at the web width direction inside with respect to the first anchor bolts. Therefore, load bearing ability of a column seat can be efficiently exhibited, and the thickness dimension of the base plate can be reduced.

The invention claimed is:  
     
       1. A column structure comprising:
 a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a base member having an upper side to which the column member is joined; 
 a first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at an opposite side of the flange from the web; and 
 a second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at a position further from the web than the first anchor member in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first anchor member in the width direction of the web, wherein the base member is fixed to the upper end side of the second anchor member at an outer side of the flange in the width direction of the web. 
 
     
     
       2. The column structure of  claim 1 , wherein an indented portion is provided in a lower side face of the base member. 
     
     
       3. A column structure comprising:
 a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a base member having an upper side to which the column member is joined; 
 a first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at an opposite side of the flange from the web; and 
 a second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at a position further from the web than the first anchor member in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first anchor member in the width direction of the web, 
 wherein the base member comprises:
 a base portion that is provided at each of the flange sides of the web; 
 a connection portion that connects together a pair of the base portions; and 
 cutaway portions that are provided between the pair of the base portions. 
 
 
     
     
       4. A column structure comprising:
 a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a base member having an upper side to which the column member is joined; 
 a first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at an opposite side of the flange from the web; and 
 a second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, and including an upper end side to which the base member is fixed at a position further from the web than the first anchor member in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first anchor member in the width direction of the web, 
 wherein one base member is provided at each of the flange sides of the web, and a gap is provided between the base members. 
 
     
     
       5. The column structure of  claim 4 , wherein a projection portion is disposed at each base member and projects out to a web side of the flange underneath the web. 
     
     
       6. A base member comprising:
 a base body that has an upper side configured to be joined to a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a first fixing portion that is provided at the base body at an opposite side of the flange from the web, and that is fixed to an upper end side of a first anchor member, the first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete; and 
 a second fixing portion that is provided at the base body at a position further from the web than the first fixing portion in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first fixing portion in a width direction of the web, and that is fixed to an upper end side of a second anchor member, the second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, 
 wherein the second fixing portion is disposed at an outer side of the flange in the width direction of the web. 
 
     
     
       7. The base member of  claim 6 , wherein an indented portion is provided in a lower side face of the base body. 
     
     
       8. A base member comprising:
 a base body that has an upper side configured to be joined to a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a first fixing portion that is provided at the base body at an opposite side of the flange from the web, and that is fixed to an upper end side of a first anchor member, the first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete; and 
 a second fixing portion that is provided at the base body at a position further from the web than the first fixing portion in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first fixing portion in a width direction of the web, and that is fixed to an upper end side of a second anchor member, the second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, 
 wherein the base body comprises:
 a base portion that is provided at each of the flange sides of the web; 
 a connection portion that connects together a pair of the base portions; and 
 cutaway portions that are provided between the pair of the base portions. 
 
 
     
     
       9. A base member comprising:
 a base body that has an upper side configured to be joined to a column member that is integrally provided with a flange at each of two sides of a web in a width direction of the web; 
 a first fixing portion that is provided at the base body at an opposite side of the flange from the web, and that is fixed to an upper end side of a first anchor member, the first anchor member including a lower end side to which a first anchor portion is attached with the lower end side anchored in concrete; and 
 a second fixing portion that is provided at the base body at a position further from the web than the first fixing portion in a direction orthogonal to the width direction of the web, and at a position closer to the flange than the first fixing portion in a width direction of the web, and that is fixed to an upper end side of a second anchor member, the second anchor member including a lower end side to which a second anchor portion is attached with the lower end side anchored in concrete, 
 wherein one base member is provided at each of the flange sides of the web, and a gap is provided between the base members. 
 
     
     
       10. The base member of  claim 9 , wherein a projection portion is disposed at the base member and projects out to a web side of the flange underneath the web.